I was eighteen when it started, just barely, and my sister Mia was nineteen, home from her first year at college for the summer. Our parents were gone for a week on their anniversary trip, leaving the house empty except for us two. Mia had always been the bold one, the one who walked around in tiny shorts and tank tops that barely covered her tits. That first night, she came into my room after midnight wearing nothing but a thin t-shirt that clung to her nipples.
She didn't knock. She just climbed onto my bed and said, "I've been thinking about your cock all year, little brother." Her hand went straight under the blanket and wrapped around my dick, stroking it hard and fast. "Fuck, you're already this big and hard for me?"
I didn't stop her. I pulled her shirt off and sucked on those perky tits while she jerked me. Her skin tasted sweet, and she moaned like she had been waiting forever. "Suck it," I told her, pushing her head down. Mia opened wide and took my cock deep into her throat, gagging but not stopping.
She bobbed fast, spit running down my balls, her hand pumping the base.
We didn't talk about right or wrong. She climbed on top, lined my cock up with her wet pussy, and sank down in one go. "God, yes," she hissed. Her cunt was tight and hot, gripping me as she rode hard, slamming her hips down again and again. I grabbed her ass and thrust up to meet her, our bodies slapping loud in the quiet house.
Mia came first, shaking and cursing, "Fuck me, fill your sister's pussy." I flipped her onto her back and pounded into her, watching her tits bounce. I shot deep inside her, pumping load after load while she held me there with her legs locked around me.
The next days were nothing but raw fucking. We did it in the kitchen, her bent over the counter while I fucked her from behind, my fingers rubbing her clit until she squirted on the floor. We did it in the shower, water running over us as I lifted her and drove my cock up into her again and again. Mia loved it dirty. She would whisper, "Cum in your big sister's cunt," or "Eat my pussy after you fill it."
One afternoon on the living room couch she sucked me off while I watched porn on my laptop, then made me watch her finger her own ass and beg me to fuck it. I stretched her tight hole with my cock, slow at first then hard, both of us groaning like animals. She came with three fingers in her pussy and my dick buried in her ass.
By the end of the week we were fucking every chance we got, no hesitation, no guilt, just pure need. Mia left for college again but we kept it going whenever she came home. Those incest teen sex stories we lived were always the same: fast, filthy, and exactly what we both wanted.
